devel/omnisharp-server: Deleted port, abandoned upstream

Fix PORTSCOUT=ignore:* uses throughout the tree

PORTSCOUT=ignore:1 is the only valid way syntax according to the
Portscout documentation. In disables the distfile version checks
completely. In order to ignore only certain version instead, it is
necessary to use other Portscout keys like skipv.

Also, remove the setting completely when it attempts to instruct
Portscout to skip versions older than the current one.

Approved by:	portmgr blanket

Remove # $FreeBSD$ from Makefiles.

lang/mono: update to version 5.2.0.215 (and enhance USES=mono)

Highlights:
 - New Roslyn compiler for C# available
 - Improved support for nuget packages in USES=mono

General:
 - fix pkg-plist: mono now produces '.pdb' debug files instead of '.mdb'
 - bump all dependant ports

USES=mono:
 - properly handle caching of nuget packages
 - add support for multiple feeds for nuget packages
 - add support for nuget dependencies in a separate file
 - add support for paket packages

Ignore mono-2.10.8, this is a version of mono not the port.

HTTP wrapper around [NRefactory] allowing C# editor plugins
to be written for any editor in any language.

This is the server component for the Vim OmniSharp plugin,
YouCompleteMe, Sublime Text 2, Sublime Text 3, Emacs
OmniSharp plugin and Atom plugin

WWW: https://github.com/OmniSharp/omnisharp-server

Reviewed by:	mat
Differential Revision:	https://reviews.freebsd.org/D13472